Constant factor mechanism



March 1953 o. w. swANsoN EI'AL 2,530,967

CONSTANT FACTOR MECHANISM 2 SHEETS-SHEET 1 Filed Sept. 1, 1950 wm mww wmws M mww 0 w .M Q W 1 W0. A m

March 10, 1953 o. w. swA-NsoN EI'AL 2,630,967

v CONSTANT FACTOR MECHANISM Filed Sept. 1, 1950 2 SHEETS-SHEET 2INVENTORS. OSCAR w SWAMSON I ERNEST 0., MOSSBE R6 94 BY' Q.

ATTORNEY Patented Mar. 10, 1953 CONSTANT FACTOR MECHANISM Oscar W.Swanson and Ernest 0. Mossberg, West Hartford, Conn., assignors toUnderwood Corporation, New York, N. Y., a corporation of DelawareApplication September 1, 1950, Serial No. 182,672

14 Claims.

This invention relates to printing calculating machines and moreparticularly to a device to permit retention of a constant factor in thevalue set-up mechanism for a plurality of computations involving theconstant factor.

One object of this invention is the provision in a printing machinecapable of addition, subtraction, multiplication and division operationsof a mechanism settable to retain a factor set-up by the keyboard in theentry devices for use in a number of distinct multiplicationcalculations.

Another object is to provide in a printing multiplying machine a factorset-up device in which the factor may be retained for a number ofoperations and wherein no resetting of such device is required for atotal taking operation.

A further object is the provision in such a machine of a factor set-upmechanism and a mechanism operable by the operator to re-indeX a setupfactor into a controlling position at any desired time.

A still further object of this invention is the design of a factorset-up mechanism for a printing calculating machine in which a factormay be retained by the use of a locking-in mechanism but which set-upmechanism is shiftable to an ineffective position to permit othermachine operations.

Still another object is the provision of a factor set-up mechanism whichmay be set to retain a selected constant factor but shiftable out ofeffective position to permit machine operations to be performed which donot involve the set-up factor and which may be re-indexed to effectiveposition by operation of a constant key.

Other incidental objects will be in part apparent and in partspecifically pointed out in the following detailed description of apreferred embodiment of the invention.

The present invention is an improvement on the mechanism shown in theco-pending application Serial No. 170,968 filed June 29, 1950 by OscarJ. Sundstrand. For this reason only so much of the structure as isrequired to set out the novel features of the invention is set outherein, reference being made to the above Sundstrand application for amore complete disclosure of the machine involved.

In the drawings:

Figure 1 is a perspective showing of the constant factor set-upmechanism,

Figure 2 is a view from the right side of the pin setting and constantmechanism,

Figure 3 is a top view, partly in section, of the constant re-indexingmechanism.

General description The present invention as disclosed is embodied in anUnderwood Sundstrand printing calculator similar to that described inthe Sundstrand application above, wherein it is particularly useful formultiplication calculations involving a constant multiplicand. Thisdevice is, however, also useful for multiplication in anadding-subtracting machine without the automatic multiplying features ofthe above aplication and is not restricted to use in a machine havingsuch automatic multiplication features.

The disclosure herein is of a part of the wellknown Underwood Sundstrandcalculating machine, further disclosure being deemed unnecessary, forsuch machine is readily available commercially and fully disclosed in U.S. Patents including among others the following patents issued to OscarJ. Sundstrand: Patent No. 1,583,102, issued May 4, 1926, No. 1,885,489,issued Nov. 1, 1932, and No. 1,965,611, issued July 10, 1934. Suchmachines comprise a 10 key keyboard operable to set pins correspondingto a value in a set of stationary pins, the pin setting members and aset of read-out members being shiftable across the field of such pins tochange the denominational relationship in the usual manner.

The read-out members are connected to a set of type barscyclicallyoper-ated to read out and print the set-up values and carryinga pair of racks which are selectively engageable on the return of thetype bars by a register to enter the set-up values in the register.

The register is also engageable with the racks following a non-entrycycle, on the forward stroke of the type bars to control the type barsto print the total in the register. During such a total takingoperation, the read-out members must be Set to a position to the side ofthe field of pins to prevent any interference with the rise of the typebars from any set pins and heretofore this has resulted in resetting allset pins. It has not been possible in these prior machines to retain anamount set up on the pins during a total taking operation.

The present invention provides means wherein an amount set up in thefield of pins may be re tained during a total taking operation and aconstant key operable to shift the read-out members back into effectiveposition with respect to the pins.

Entry of a constant factor Entry of a factor which is to be keptavailable in the pins is performed in the same manner in this machine asin the prior machines of this type with the exception that all availabledigital positions must be indexed. This requires that the factor beindexed in the highest denominational position by entering a number ofUs following the constant or if the constant factor is to be positionedbelow the highest order, by first entering a number of s into the higherunused orders.

Referring to Figures 1, 2 and 3, a number of numeral keys Iii areconnected to a like number of push rods I! mounted on a swinging gatei2, the rear ends of the rods I resting adjacent one vertical line of astationary field of settable pins 13. The gate 12 is spring urged to theright, Figure 3, and is retained against the urge of its spring by theengagement of a notched arcuate plate I l with an upper end 55 of gate1122. Upon depression of any key lll'to set through its associated pushrod ii, the pin it to the rear of rod H, an escapement push rod it isalso operated to thrust against plate Hi and move it rearwardly to freeend I5 of gate 12. The gate 52 then moves to the right until the end ofpush rod it strikes against the side of the adjacent notch of plate l4and when the operated key it is released rod it is retracted and gate i2moved to engage the side of the next notch of plate positioning the pushrods H in line with the next vertical row of pins It in readiness forentry "of the next digit.

Notched plate I4 is positioned on a stationary stud l9 at its left endand carries a lever 2d piv oted thereon at 2|. Lever 2t passes in frontof end [5 of gate l2 and is bent around at its right end to engage a pin22 on plate i to limit the movement of plate Hi to prevent any undesiredescapement movement of gate l2 under impetus of a hard depression of oneof the keys it. A spring 23 connected to the left end of lever 28 servesto hold both plate i l and lever 2i! in engagement with-end it of gatei2.

A stud 25, Figure 2, on the rear end of gate is engaged in a slot of acarriage 26 slidable on a shaft 21 to move carriage 26 synchronouslyWith gate [2. A plurality of read-out rods 23 slidably carried bycarriage 26 are moved thereby into position to engage the set pins it.These read-out rods are connected as in the afore mentioned patents, tothe usual type bars, not shown, to control the values printed andentered into the register in accordance with the settings of pins I3. Aslotted pin restoring bar 29 is slidably mounted on the right end ofcarriage 26 to restore any set pins It to unset position as the carriage26 moves to the left by power at the end of any machine cycle.

The position of gate [2 at any time is indicated to the operator bymovement of an indicator arm 30 movable behind slots in the machinecasing. Indicator arm 35 is fixed to a slidable rack 3| connected by apinion 32 having a fixed pivot 33 to a rack 34 fixed to end I5 of gatel2.

Locking in a constant factor 4 38 in a slot 43 of slide 39. The left endof lock is is bent down into the path of ear 3? of rack 3e and when rack34 moves into the last denominational position of gate l2, ear 3? moveslatch 38 to move ear 42 of latch 38 out of slot '53 of slide 39 and freeslide 39.

Slide 39 is slidable on shaft 40 and a stud 44 and is moved by a lever35 pivoted on a fixed stud it and provided with a slot M embracing astud it on slide 33. In the normal rearward position of slide 3%, theset up values on pins is are destroyed by bar 29 every time gate I2 andcarriage 2e are returned to their home position. When lever 35 is movedto the front of the machine, bar 29 is shifted to align the slots ie orbar 29 with pins l3 and restoration of gate :2 and carriage 25 will notrestore the set pins 63. Slide 39 is provided with a slotted extension53 which engages a pin 5t of an arm 55 pivoted at 5% on the machineframe. The rear end of arm 55 is slotted to engage, when carriage is inits rightmost position, an ear 5? fixed to the lower end of bar 29.Forward movement of slide 39 will rock arm 55 counterclockwise, Figure2,to raise bar 29 to its upper position, a detent arm 53 pivoted oncarriage 28% serving to retain bar in either set position. An ear tit onthe upper end of bar 25 is positioned either above or below a lower railof a fixed channel bar $5 at all positions of carriage 26 except thefully indexed position to prevent any undesired shift of bar 29. Insummary, when lever 45 is moved to its forward position, bar is isshifted to its upper ineffective position and cannot restore the setpinslt upon return to normal position, hence the factor set up on pinsi3 is retained for further use.

Slide is is provided with a second slot 69 positioned, when lever 45 isin the forward constant retaining position, adjacent ear 42 of lock 38.When swinging gate 52 and rack 36 move out of the fully indexed positionlock Bil is freed to move ear 12 into slot Gil. Thus slide 39 and leverA5 are locked in either of their two positions at all times that gate l2and rack 34 are out of the fully indexed position to prevent any shiftof the lever 35, slide 39 and arm 55 without a corresponding shift ofslidable bar 29 on carriage 26.

It is also desirable to prevent operation of keys it when a constantfactor is set up in pins 18 to prevent change in the factor. To thisend, use is made of a key lock mechanism present in the standard addinge. This key lock comprises a plate 52 gure shiftable forward- ].y tounderlie the bottoms of it and prevent their depression. Plate isconnected to a lever "53 pivoted on a fixed. pivot E l conneeten to alinked urged rearwardly by a spring i to hold plate 62 in an ineifectiveposition.

Normally this plate 82 is moved to key locking position during achinecycling. The 'ma'in shaft 5? of the n1&'3 ,\.113 carries, Figure l, aroller on an. arm E8 to the shaft SE. A second arm til free on shaftii'i is connected by a spring H to press its stud 32 against arm t3.Shortly after shaft t? starts rotating counterclockwise, sted "a2 on armiii strikes against a shoulder i3 and moves (iii and lock plate 62forwardly to key locking position. A shoulder "M on the rear end of arm55 is moved in this position of arm 55 in front of a stationary guide15, spring 55 thereupon moving arm 55 upwardly to latch the arm in itsmoved position. Upon return of shaft 67 to its Figure 1 position, roller58 strikes and lowers the rear end of armtfi to release shoulder 14 fromguide 75 for return of arm 65 and lock plate 52 to unlocking position.

This key locking mechanism is used to look the keyboard l when aconstant factor is being retained in the pins l3. A stud l8, Figure l,on arm 55 is positioned in a slot of a lever i9 pivotecl on a fixed stud89. Also pivoted on stud 86 and connected to lever if] by a spring iiiis an arm '82, spring 81 urging arm 82 clockwise in Figures 1 and 2against a screw 33 in lever it. The lower end of arm 32 rests in back ofa stud 84 fixed in arm 65. Through this mechanism, as lever 45 is movedforwardly to retain a constant fact-or set in pins 53, lever 79 and arm82 are rocked by arm 55 to move arm forwardly to lock keys it againstoperation.

Reentry of the constant factor After the constant factor has been lockedas above set out and has been used for the first calculation, swinginggate 52 will generally be positioned at some denominational positionother the fully indexed position and if a total taking operation hasbeen performed, gate 52 will be in the home position. When it is desiredto reenter the previously set constant factor, a constant key 99 isoperated. This key 39 when operated releases the notch escapement rackit for gate 2 to permit movement of gate 52 to the fully indexedposition. This movement gate 52 effects a shift of the read-out pins asunder pins l3 which have remained set to permit further entries of thefactor.

Ke 9% is pivoted on the forward arm of a lever ill pivoted at Q2 to theframework for the keyboard, a spring connected to key 953 and astationary stud alt serving to maintain key till and lever Si in thenormal position. An upper arm of lever Si is engaged in a hole of an armof a horizontal lever other arm a latch pawl 85 pivotally mountedthereon at 93 and urged by a spring Q8 connected between lever 95 andlatch pawl so to a counterclockwise position, Figures 1 and 3.Counterclockwise movement of latch pawl E limited by engagement of anear 9% bent down from pawl and the arm of lever 35. Latch pawl 96 holdsa slide iflil against rearward movement under the urge of a spring it!connected to a post i i-2 on slide H26 and a stationary frame part bythe engagement of a shoulder on the rear end of pawl 95 with an ear Hi3bent ofi of slide ltlil.

Constant key 95 is locked when lever 45 is in its rearward position,that is when no con stant is locked into the pins [3, by an ear I64 bentoif an upstandin portion of arm 5i; resting over the rear end of lever9|. When lever 45 is moved forwardly to retain a set-up constant, arm 55is rocked to move ear I84 forwardly from above the rear arm of lever 9|and thereby free key 98 for operation. A detent pawl I05 pivoted onpivot 92 for lever Si is urged upwardly by a spring I06 into engagementwith ear I04 and serves to hold lever 45, slide 39 and arm 55 in eitherset position. Depression of key as when it is free rocks lever 9| torock lever 95 clockwise and withdraw pawl 91 from ear H33 of slide lilo.The resulting rearward movement of slide I60 acting through a lever I01pivoted thereon at I98 and urged clockwise to engagement of its forwardarm with post 102 by a spring I69 between slide I60 and lever I01,strikes square stud 2| on escapement plate hi to move plate I4rearwardly and free gate I2 95 which carries on its -i for movement toits rightmost fully indexed position, thus in effect re-entering thepreviously set constant factor.

Rearward movement of slide Hill also acts to reset the conventionalhinge blank H0 to prevent a total taking operation. This hinge blank H9is moved forwardly during a cycle in which swinging gate i2 is in itshome position by a stud III on a plate H2 fixed to main shaft 6? andwhen blank H0 is so moved, it so controls the machine that the nextcycle shall be a total taking cycle. When key is depressed, the nextcycle is to be an entering cycle and hinge blank I it must be restoredrearwardly which is done by an extension H3 of slide I00 engaging blankI it in the rearward movement of slide Iilil.

Slide I653 is returned to its normal latched condition during thefollowing machine cycle. Upon release of key 98, levers 9| and arerestored to their normal positions by spring 93 and pawl 96 engages earH73 of slide its, sprin 5B yielding to allow return of lever 95. An armH5 pivoted at H6 to a stationary frame part is tensioned by a spring H1to hold a roller H8 on the lower end of arm H5 against the left p N3 ofslide me. When slide it!) is freed from pawl 93 and moves rearwardly, itcarries arm H5 with it into the path of a stud H9 on plate H2 on themain shaft 61. Durin the ensuing machine cycle, stud H9 strikes arm H5and. restores slide Hill to normal position wherein pawl Q6 moves behindear Hi3 on the slide Hill to relatch the slide it!!! in its homeposition.

It has been mentioned that lever I0! is pivotally mounted on slide I00.This is to avoid a possible source of error in operation of the machine.It will be noted that if key 50 is retained depressed or is operatedduring a machine cycle, slide its will be free to move rearwardly duringthe latter half of the cycle and consequently would free escapementplate M from swinging gate i2 after gate 12 had been restored to normalposition. To prevent such an erroneous release of gate l2, lever I0! ispivoted on slide I00 and has an arm I20, Figure 3, which extendsrearwardly into the path of end l5 of gate l2, Then when gate l2overthrows past its normal home position as it does on everyrestoration, the end IE will strike arm [20 to rock lever I01counterclockwise in Figure 3 and move its rearward arm from square stud2 I. This will permit escapement plate M to reengage end 15 of swinginggate [2 and retain the gate in its home position even though slide (00is released.

The above description of a preferred embodiment of the invention is forthe purpose of illustrating the invention only and is not to beconstrued as limiting the scope of the following claims.

What is claimed is:

I 1. In a machine of the class described having a set of keys, a field0f settable pins, means operable by said keys and shiftable relativelyto said pins for enabling operation of said keys to set a multi-digitvalue in said pins, a member relatively shiftable with respect to saidpins to restore any set pins to a non-set position, a norinally latchedmanipulative member, means controlled by said relatively shiftable pinsetting means to free said manipulative member from said latchedcondition and mechanism operated by said manipulative member to movesaid relatively shiftable member to a non-resetting position withrespect to said field of pins.

2. In a machine'of the class described having 7 a set of keys, a fieldof settable pins, means op erable by said keys and shiftable relativelyto said pins for enabling operation of said keys to set a multi-digitvalue in said pins, a member relatively shiftable with respect to saidpins to restore any set pins to a non-set position, a normally latchedmanipulative member, means controlled by said relatively .shiftable pinsetting means to free said'manipulative member from said latchedcondition, mechanism operated by said manipulative member to move saidrelatively shiftable member to a non-resetting position with respect tosaid field of pins, a cyclically operable locking member to preventoperation of said keys and a connection from said manipulative member tosaid locking member to move said locking member to locking position whensaid manipulative member is in one position.

3. In a machine of the class described having a set of keys, a field ofsettable pins, key operable means shiftable relatively to said field ofpins for setting multi-digit values in said pins, a pin restoring membershiftable relatively to said field of pins with said key operable means,a manipulative means operable to shift said pin restoring member to anineffective position, a latch for said manipulative member and latchreleasing means operable in one relative position of said key operatedmeans and said field of pins to release said latch.

l. In a machine of the class described having a set of keys, a field ofsettable pins, key operable means shiftable relatively to said field ofpins for setting multi-digit values in said pins, a pin restoring membershiftable relatively to said field of pins with said key operable means,a manipulative means operable to shift said pin restoring m mber to anineffective position, a latch for said manipulatve member, latchreleasing means operable in one relative position of said key operatedmeans and said field of pins to release said latch, means to lock saidkeys against depression and a connection from said manipulative means tosaid key locking means to lock said keys when said pin restoring memberis shifted to ineiiective position.

5. In an adding machine having a set of numeral keys, a field ofsettable pins, means relatively shiftable across said field of pins andoperable by said numeral keys to a multidigit value in said pins,denomination by denomination, a pin restoring member relativelyshiftable across said field of pins with said relatively shiitablemeanaa manipulative means operable to move said pin restoring memberacross the direction of relative shift of field of pins and said numeralkey operable means to an ineffestive position and a detent to hold saidpin restoring member in either of its positions.

6. In an adding machine having a set of numeral keys, a field ofsettable pins, means relatively shiftable across said field of pins andoperable by said numeral keys to set a multidigit value in said pins,denomination by denomination, a pin restoring member relativelyshiftable across said field of pins by said relatively shiftable means,a manipulative member connectabie to said pin restoring member in onedenominational position of said relatively shiftable means and saidfield of pins and operable to shift said pin restoring member to anineffective position, and means stationary with respect to said field ofpins to prevent shift of said pin restoring member at all timesexceptwhen said pin restoring member is connected to said manipulativemember.

*7. In an adding machine having a set of numeral keys, a field ofsettable pins, means relatively shiftable across said field of pins andoperable by said numeral keys to set a multi-digit value in said pins,denomination by denomination, a pin restoring member relativelyshiftable across said field of pins with said relatively shiftablemeans, a manipulative member connecta-ble to said pin restoring memberin one denominational position of said relatively shiftable means andsaid field of pins and operable to shift said pin restoring member to anineffective posi means stationary with respect to said field of pins toprevent shift of said pin restoring member at all times except when saidpin restoring member is connected to said manipulative member, a latchfor said manipulative member and latch releasing means effective only insaid one denominational position.

8. In a machine of the class described having a plurality of numeralkeys, a group of settable pins, mechanisms, comprising a plurality ofactuators and key operable pin setting means, shiftable relatively tosaid group of settable pins and urged in one direction of relativemotion, escapeinent n to restrain said relatively shiftable mechanisms,said escapement mechanism *perable by said keys to enable a one steprelative movement of said shif-table mechanisms, a r eindexing mechanismoperable by said reindexing key to render said escapement mechanismineiicctive and thereby free said relatively shiftaoie mechanisms formovement to an end position, a fill restoring member relativelyshiftacross sa' 01' se table pins with said l y o erable p w settingmeans and said actuators, a manipulative member and a linkage operableby manipulative member and connected to pin restoring member in said endposition of said shiftable mechanisms, to shift said pm resetting memberto an ineffective positicn.

9. In a machine of the class described having a plurality of nurne "a1keys, a group of settable pins, mechanisms, comprising a plurality ofactuators and key operable pin setting means shiftable relatively tosaid group of settable pins and urged in one direction of relativemotion, escapeinent mechanism to restrain said relatively shiftablemechanisms, said escapement mechanism operable by said keys to enable aone step relative movement of said shiitable mechanisms, a rue-indexingkey, mechanism operable by said reindexing key to render said escapementmechanism ineffective and thereby f ee said relatively shit-tablemechanisms for movement to an end position, a pin restoring memberrelatively shiftable across said group of pins with said keyoperablemeans and said actuators, a manipulative member, a linkage operable bythe manipulative member and connected to said pin restoring member inend position of said shiftable mechanisms, to shift said pin resettingmember to an ineffective position, a latch for said manipulative member,and means on the movable one of sale relatively shiftable mechanisms torelease said latch When said relatively shiftable mechanisms are in thefinal position.

10. In a m chine of the class described having a plurality of numeralkeys, a group of setta ble pins, mechanisms, comprising a plurality ofactuators and key operable pin setting means, shiftable relatively tosaid group of settable pins and urged in one direction of relativemotion, escapement mechanism to restrain said relatively shif-tablemechanisms, said escapement mechanism operable by said keys to enable aone step relative movement of said shiftable mechanisms, a 18-lI1C1EXlDgkey, mechanism operable by said re-indexing key to render saidescapement mechanism ineffective and thereby free said relativelyshiitable mechanisms for movement to an end position, a pin restoringmember relatively shiftab-le across said group of settable pins withsaid key operable pin setting means and said actuators, a manipulativemember, a linkage operable by said manipulative member and connected tosaid pin restoring member in said end position of said relativelyshiftable mechanisms, to shift said pin resetting member to anineffective position and a lock for said re-indexing key, said lockreleasable by said manipulative member in its pin restoring memberdisabling position.

11. In a machine of the class described having a plurality of numeralkeys, a group of settable pins, mechanisms, comprising a plurality ofactuators and key operable .pin setting means, shiftab-le relatively tosaid group of set-table pins and urged in one direction of relativemotion, escapement mechanism to restrain said relatively shiftablemechanisms, said escapement mechanism operable by said keys to enable aone step relative movement of said shiftable mechanisms, a re-indexingkey, mechanism operable by said re-indexing key to render saidescapement mechanism ineffective and thereby free said relativelyshii'table mechanisms for movement to an end position, a pin restoringmember relatively shit-table across said group of settable pins withsaid key operable pin setting means and said actuators, a manipulativemember, a linkage operable by said manipulative member and connected tosaid pin restoring member in said end position of said shiftablemechanisms, to shift said pin resetting member to an ineffective.position, a latch for said manipulative member, said latch releasableby said shiftable mechanisms in the final position, and a lock for saidre-indexing key, said lock moved out of latching position by saidmanipulative member upon movement to shift said pin resetting member tosaid ineifective position.

12. In a machine of the class described having a group of numeral keys,a field of settable pins, a plurality of register actuators, a pluralityof pin setting linkages, one from each key to an associated row of pins,said actuators and said pin setting linkages being relatively shiftablewith respect to said pins to set said pins seriatim to represent amulti-denominational value, a pin restoring member shiftable withrespect to said pins, and an escapement mechanism operable by said keysto permit step by step shifting of said relatively shiftable pins,actuators, linkages and pin restoring member, the combination of amanipulative member, means connected to said pin restoring member in theend shifted position of said pin restoring member with respect to saidfield of pins and operable by said manipulative member to shift said pinrestoring member to an ineffective position, a latch for saidmanipulative member and means operable in said end position of saidrelatively shiftable linkages and pins to release said latch.

13. In a machine of the class described having a group of numeral keys,a field of settable pins, mechanisms relatively shiftable with respectto said pins to set said pins seriatim to represent amulti-denominational value, said relatively shiftab-le mechanismscomprising a plurality of actuators, a plurality of pin setting membersactuatable by said keys and a pin restoring member, and an escapementmechanism operable by said keys to permit step by step shifting of saidrelatively shit-table mechanisms, the combination of a manipulativemember, means connected to said pin restoring member in the finalshifted position of said pin restoring member with respect to said fieldof pin and operable by said manipulative member to shift said pinrestoring member to an ineffective position, a latch for saidmanipulative member, means operable in the final position of saidrelatively shiftable mechanisms to release said latch, a reindexing key,means controlled by said re-indexing key for releasing said escapementmechanism to permit movement of said relatively shiftable mechanisms tothe end position, and means settable by said manipulative member in theposition retaining said pin restoring member efiective to preventoperation of said re-indexing key.

14. In a machine of the class described, having a set of numeral keys, agroup of settable pins, key operable members shiftable across said pinsto enable operation of said keys to set said pins to represent amulti-digit number, a pin restoring bar and a plurality of registeractuators shiftable with said key operable members and an escapementmechanism operable .by said keys for enabling step by step shifting ofsaid key opera ble members, said restoring :bar and said actuators, thecombination of a manipulative member, means operable by saidmanipulative member and engageable by said pin restoring bar in an endshifted position of said bar to move said pin restoring bar to anineffective position, a. re-indexing key, means normally retained bysaid re-indexing key and releasable thereby to disable said escapementmechanism and thereby permit movement of said key operable means andsaid pin restoring bar to the end shifted position, said means settableby said manipulative member to engage a part of said re-indexing key toprevent operation of said re-indexing key when said pin restoring bar isin the efiective position.

OSCAR W. SWANSON. ERNEST O. MOSSBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,145,599 Landsiedel July 6, 19152,152,320 Llorens Mar. 28, 1939

